Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Four Wheel Drive (4WD) Systems: Notes
2008 Lincoln Navigator RWDSECTION Notes
WARNING: This page is about a different variant/trim than selected.
The 1-speed torque-on-demand (Navigator) and 2-speed torque-on-demand (Expedition) Four-Wheel Drive (4WD) systems consist of the following:
- Mode Select Switch (MSS)
- 4X4 control module
- Integrated Wheel End (IWE) solenoid
- IWEs
- 4WD mode indicators and messages in the Instrument Cluster (IC) message center
- Transfer case assembly
- Transfer case shift motor
- Steering wheel angle signal from ABS module via High Speed Controller Area Network (HS-CAN)
- Accelerator Pedal Position (APP) output from the PCM via HS-CAN
- Wheel speed signals from the ABS via HS-CAN
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.